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selftests/bpf: Test for btf_load command. 

Improve selftest to check that btf_load is working from bpf program.

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20210514003623.28033-8-alexei.starovoitov@gmail.com
This commit is contained in:
Alexei Starovoitov 2021-05-13 17:36:09 -07:00 committed by Daniel Borkmann
parent c571bd752e
commit 2341d6bb13
2 changed files with 53 additions and 0 deletions
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3
tools/testing/selftests/bpf/prog_tests/syscall.c
View File

@ -9,6 +9,7 @@ struct args {
int max_entries;
int map_fd;
int prog_fd;
int btf_fd;
};
void test_syscall(void)
@ -49,4 +50,6 @@ cleanup:
close(ctx.prog_fd);
if (ctx.map_fd > 0)
close(ctx.map_fd);
if (ctx.btf_fd > 0)
close(ctx.btf_fd);
}

50
tools/testing/selftests/bpf/progs/syscall.c
View File

@ -5,6 +5,7 @@
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>
#include <../../../tools/include/linux/filter.h>
#include <linux/btf.h>
char _license[] SEC("license") = "GPL";
@ -14,8 +15,48 @@ struct args {
int max_entries;
int map_fd;
int prog_fd;
int btf_fd;
};
#define BTF_INFO_ENC(kind, kind_flag, vlen) \
((!!(kind_flag) << 31) | ((kind) << 24) | ((vlen) & BTF_MAX_VLEN))
#define BTF_TYPE_ENC(name, info, size_or_type) (name), (info), (size_or_type)
#define BTF_INT_ENC(encoding, bits_offset, nr_bits) \
((encoding) << 24 | (bits_offset) << 16 | (nr_bits))
#define BTF_TYPE_INT_ENC(name, encoding, bits_offset, bits, sz) \
BTF_TYPE_ENC(name, BTF_INFO_ENC(BTF_KIND_INT, 0, 0), sz), \
BTF_INT_ENC(encoding, bits_offset, bits)
static int btf_load(void)
{
struct btf_blob {
struct btf_header btf_hdr;
__u32 types[8];
__u32 str;
} raw_btf = {
.btf_hdr = {
.magic = BTF_MAGIC,
.version = BTF_VERSION,
.hdr_len = sizeof(struct btf_header),
.type_len = sizeof(__u32) * 8,
.str_off = sizeof(__u32) * 8,
.str_len = sizeof(__u32),
},
.types = {
/* long */
BTF_TYPE_INT_ENC(0, BTF_INT_SIGNED, 0, 64, 8), /* [1] */
/* unsigned long */
BTF_TYPE_INT_ENC(0, 0, 0, 64, 8), /* [2] */
},
};
static union bpf_attr btf_load_attr = {
.btf_size = sizeof(raw_btf),
};
btf_load_attr.btf = (long)&raw_btf;
return bpf_sys_bpf(BPF_BTF_LOAD, &btf_load_attr, sizeof(btf_load_attr));
}
SEC("syscall")
int bpf_prog(struct args *ctx)
{
@ -33,6 +74,8 @@ int bpf_prog(struct args *ctx)
.map_type = BPF_MAP_TYPE_HASH,
.key_size = 8,
.value_size = 8,
.btf_key_type_id = 1,
.btf_value_type_id = 2,
};
static union bpf_attr map_update_attr = { .map_fd = 1, };
static __u64 key = 12;
@ -43,7 +86,14 @@ int bpf_prog(struct args *ctx)
};
int ret;
ret = btf_load();
if (ret <= 0)
return ret;
ctx->btf_fd = ret;
map_create_attr.max_entries = ctx->max_entries;
map_create_attr.btf_fd = ret;
prog_load_attr.license = (long) license;
prog_load_attr.insns = (long) insns;
prog_load_attr.log_buf = ctx->log_buf;